CISCO-WAN-ATM-COSB-MIB

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Organization: Cisco Systems, Inc.

Last Updated: 2003-03-21

Category: ATM, Quality of Service, Vendor: Cisco Devices

Description: Manages Cisco WAN ATM Class of Service Buffer (COSB) queuing parameters for traffic shaping.

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What Is CISCO-WAN-ATM-COSB-MIB?

CISCO-WAN-ATM-COSB-MIB manages Class-of-Service Buffer (COSB) queuing on Cisco WAN ATM platforms, where each virtual interface maintains multiple CoS queues mapped to ATM traffic types such as CBR, VBR-rt, and ABR to provide quality-of-service differentiation. It exposes alarm-configuration objects for cell-discard thresholds per COSB, an interval-statistics table tracking cell arrivals, discards, and departures over configurable intervals, and general alarm-status objects. This is a performance/traffic-monitoring MIB: administrators watch cell discard counts relative to arrivals and departures to detect congestion or QoS violations on a specific CoS queue, and check the alarm status to see if a discard threshold alarm has fired. It operates within the broader Cisco WAN ATM connection/QoS MIB family on MGX platforms, relying on the underlying ATM interface and connection MIBs for interface context. It is deployed on Cisco MGX ATM switch service modules where per-CoS-queue traffic shaping and congestion monitoring are required. Engineers can download the CISCO-WAN-ATM-COSB-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in CISCO-WAN-ATM-COSB-MIB. Use the built-in SNMP Monitoring Browser to explore available variables, view their current values and descriptions, and select the objects you want to monitor. You can then create SNMP monitors, configure thresholds, and receive alerts when monitored values change.

Supported Devices

Cisco MGX WAN ATM switch service module

Monitoring Examples

An operator would poll cwacIntervalTable/cwacIntervalEntry keyed by cwacCosbIndex and cwacIntervalNumber, comparing cwacIntCellDiscards against cwacIntCellArrivals to compute a discard ratio for a specific CoS buffer; a rising ratio indicates that queue is congested and dropping ATM cells. The cwacStatsAlarmConfgTable's cwacCosbCurrentCellsDiscThres defines the threshold at which cwacStatsAlarmStatus would flag an active discard alarm for that buffer. cwacValidIntervals tells the poller how many completed statistics intervals are available to retrieve.

What Can Be Monitored

cell arrivals/discards/departures per CoS buffer
discard alarm threshold and status
per-interval traffic statistics
valid statistics intervals available

Imported Objects

From CISCOWAN-SMI

ciscoWan

OBJECT-IDENTITY

From IF-MIB

ifIndex

OBJECT-TYPE

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

Counter32
Counter64
Integer32
MODULE-IDENTITY
OBJECT-TYPE

How to Use in IPNetwork Monitor

Example using cwacIntCellArrivals OID:

Select a Cisco MGX WAN ATM switching platform (legacy) as the target host to create a monitor — the SNMP service should be up and running on it. Click New Monitor, then check SNMP Custom on the Favorites tab, click Next, and confirm the host. On the next page, click Select... to open the built-in SNMP MIB Browser and type cwacIntCellArrivals into the Find box to locate it in the OID tree, selecting the specific row/instance you want to monitor since this is a table column, then select it and click OK. The number of cells arrived at the queue during a particular 15 minute interval. On the monitor's Main parameters page you can set the target's SNMP port (default 161), credentials, polling interval, and other settings — see the SNMP Monitor help for details. On the State conditions and Alerting tabs, configure when the monitor should change state and trigger an alert; since this is a Counter32-type OID, Value bounds is the most useful condition here — trigger an alert if the counter increases sharply between polls relative to its normal baseline, since an unexpected spike often reflects a real change in traffic or activity. Click Finish to create the monitor; you can adjust any parameter later.

OIDs

OID symbolic	OID numeric	Type	Access	Description
ciscoWanAtmCosbMIB	1.3.6.1.4.1.351.150.16			The MIB to manage CoS(Class of Service) queue/buffer related parameters. One or more virtual interfaces may exist on a physical interface or a channelized interface. Every virtual interface has certain number (e.g. 16) of CoS queues. These queues are also known as Class Of Service Buffers. Every COS queue maps to an ATM trafiic type such as CBR, VBR-rt, ABR etc. These COS queues are used to provide QOS (quality of service), depending on the corresponding ATM trafiic type. This MIB provides management functionality such as Threshold Crossing Alarms(TCA) for cell discards and interval statistics for these COS queues.
ciscoWanAtmCosbMIBObjects	1.3.6.1.4.1.351.150.16.1
cwacConfig	1.3.6.1.4.1.351.150.16.1.1
cwacStatistics	1.3.6.1.4.1.351.150.16.1.2
cwacStatsAlarmConfgTable	1.3.6.1.4.1.351.150.16.1.2.1		not-accessible	This table contains alarm configuration parameters related to CoS queue. Entries in this table are automatically created when a new virtual interface is added.
cwacStatsAlarmConfgEntry	1.3.6.1.4.1.351.150.16.1.2.1.1		not-accessible	An entry in CoS queue alarm configuration table. This table is indexed by ifIndex, that belongs to the ifTable entry with ifType value atmVirtual(149), and cwacCosbIndex.
I32 cwacCosbIndex	1.3.6.1.4.1.351.150.16.1.2.1.1.1	Integer32	not-accessible	This is the CoS queue number to which this entry belongs.
I32 cwacCosbCurrentCellsDiscThres	1.3.6.1.4.1.351.150.16.1.2.1.1.2	Integer32	read-write	This object indicates the threshold for cell discards for the current 15-min interval, above which alarm is generated.
I32 cwacStatsAlarmStatus	1.3.6.1.4.1.351.150.16.1.2.1.1.3	Integer32	read-only	This is a bitmap that shows the status of TCA(Threshold Crossing Alarm) of current queue. This bitmap is sent as part of the trap that is generated as part of TCA being raised. Bit assignmed is as follows: ---------------------------- 1 Cell discard 15 minute threshold was exceeded.
I32 cwacValidIntervals	1.3.6.1.4.1.351.150.16.1.2.1.1.4	Integer32	read-only	The number of previous intervals for which valid data has been stored.
cwacIntervalTable	1.3.6.1.4.1.351.150.16.1.2.2		not-accessible	This table reflects interval statistics associated with each of the CoS queues. Entries in this table are automatically created when a new virtual interface is added.
cwacIntervalEntry	1.3.6.1.4.1.351.150.16.1.2.2.1		not-accessible	An entry for per virtual interface CoS queue interval statistics. In addition to the current 15-minute interval bucket, the previous 24 hours worth of 15-minute interval buckets are collected for each vitual interface. This table is indexed by ifIndex, that belongs to the ifTable entry with ifType value atmVirtual(149), cwacCosbIndex and cwacIntervalNumber.
I32 cwacIntervalNumber	1.3.6.1.4.1.351.150.16.1.2.2.1.1	Integer32	not-accessible	A number used to uniquely identify per virtual interface CoS queue interval statistics. 0 is used to identify the current 15-minute interval. 1-96 identify the previous 24 hours of 15-minute interval buckets.
C32 cwacIntCellArrivalsEx	1.3.6.1.4.1.351.150.16.1.2.2.1.2	Counter32	read-only	The number of cells arrived at the queue during a particular 15 minute interval.
C32 cwacIntCellDiscards	1.3.6.1.4.1.351.150.16.1.2.2.1.3	Counter32	read-only	The number of cells discarded due to congestion during a particular 15 minute interval.
C32 cwacIntCellDeparts	1.3.6.1.4.1.351.150.16.1.2.2.1.4	Counter32	read-only	The number of cells that left the QBIN during a particular 15 minute interval.
C32 cwacHighIntCellArrivals	1.3.6.1.4.1.351.150.16.1.2.2.1.5	Counter32	read-only	The upper 32-bits of the number of cells arrived at the queue during a particular 15-minute interval.
C32 cwacHighIntCellDiscards	1.3.6.1.4.1.351.150.16.1.2.2.1.6	Counter32	read-only	The upper 32-bits of the number of cells discarded due to congestion during a particular 15-minute interval.
C32 cwacHighIntCellDeparts	1.3.6.1.4.1.351.150.16.1.2.2.1.7	Counter32	read-only	The upper 32-bits of the number of cells that left the QBIN during a particular 15-minute interval.
C64 cwacHCIntCellArrivals	1.3.6.1.4.1.351.150.16.1.2.2.1.8	Counter64	read-only	The 64 bit value of the number of cells arriving at the queue during a particular 15-minute interval.
C64 cwacHCIntCellDiscards	1.3.6.1.4.1.351.150.16.1.2.2.1.9	Counter64	read-only	The 64 bit value of the number of cells discarded due to congestion during a particular 15-minute interval.
C64 cwacHCIntCellDeparts	1.3.6.1.4.1.351.150.16.1.2.2.1.10	Counter64	read-only	The 64 bit value of the number of cells that left the QBIN during a particular 15-minute interval.
ciscoWanAtmCosbMIBConformance	1.3.6.1.4.1.351.150.16.2
ciscoWanAtmCosbMIBCompliances	1.3.6.1.4.1.351.150.16.2.1
ciscoWanAtmCosbMIBCompliance	1.3.6.1.4.1.351.150.16.2.1.1			The Compliance statement for CoS queue configuration group.
ciscoWanAtmCosbMIBCompliance1	1.3.6.1.4.1.351.150.16.2.1.2			The Compliance statement for CoS queue configuration group.
ciscoWanAtmCosbMIBGroups	1.3.6.1.4.1.351.150.16.2.2
ciscoWanAtmCosbAlarmMIBGroup	1.3.6.1.4.1.351.150.16.2.2.1			The statistical per virtual interface CoS queue alarm group.
ciscoWanAtmCosbAlarmMIBGroup1	1.3.6.1.4.1.351.150.16.2.2.2			The statistical per virtual interface CoS queue alarm group.
ciscoHCWanAtmCosbAlarmMIBGroup	1.3.6.1.4.1.351.150.16.2.2.3			The statistical per virtual interface CoS queue alarm group.

RFC description

Vendor-private Cisco MIB managing Class of Service (CoS) queue and buffer parameters for ATM virtual interfaces; provides QOS functionality and threshold crossing alarms for cell discards.

Start monitoring Cisco MGX WAN ATM switching platforms (legacy) with a free 30-day trial of IPNetwork Monitor. Import MIBs, browse SNMP OIDs, create custom SNMP monitors, configure alerts, and monitor any SNMP-enabled network device from a single console.

Download CISCO-WAN-ATM-COSB-MIB